On Thu, 4 Dec 2003 11:08:21 -0600 (CST),
(Richard Harrison) wrote:
Yuri Blanarovich posted ON4UN`s Fig 9-22 from "Low-Band DXing".
45-degrees of the 90-degree total length of a center-loaded whip comes
from the loading coil. Current tapers cosinusoidally from 1A at the
drivepoint to 0A at the tip.

Hi Richard,

First, and unfortunately, the antenna offered was never anywhere close
to 45° tall. The one Yuri posted barely stood 20° tall.

Second, Yuri's complaint centered on the notion of Modeling, not
measuring. He was making a plea to improve the accuracy and
efficiency of Modelers (all of this is EZNEC implicit, or by extension
NEC generically). Yuri never demonstrated the so-called cosinusoidal
variation in either Models or in Measurement. In fact, Yuri never
demonstrated ANY variation in current along ANY radiator.

Third, the argument of lumped or distributed circuit properties had
been answered with a protocol BEFORE the argument started. The
protocol offered every bit of correlation to ON4UN's drawings.

Fourth, this correlation did not demonstrate a slavish equality to the
so-called cosinusoidal variation, but rather demonstrated a conceptual
agreement. In fact, the Model data shows a divergence from that
curve.

Fifth, no one has bothered to demonstrate anywhere, that with the
protocol, that it is or is not born out in measurement.

Six, the differences of Models employing the protocol and those not
employing it shows about 0.5dB difference. This responds to the
original complaint of Yuri, in that no remarkable efficiencies are
gained or lost by this debate. To make matters worse, no Measure of
differences has been made to accept or dismiss this Model either.
This of course returns us to methods and accuracies, and given the
forecast of 0.5dB, the prospects of that turning into a metaphysical
freak show are more prominent than field tests resolving it in the
noise.

73's
Richard Clark, KB7QHC